Re: [R-pkg-devel] OpenMP on MacOS
Ensure you surround all your omp pragmas like so: #ifdef _OPENMP #pragma omp parallel ... #endif Essentially, detecting the operating system is not enough -- you need to condition your use of OpenMP if and only if _OPENMP is available. You should also do the same for #if _OPENMP #include #endif Note that this will also make your loops sequential when OpenMP is not available. On Mon, 7 Jun 2021 at 21:52, Konrad Krämer via R-package-devel wrote: > > Dear all, > I have a problem regarding OpenMP on Mac OS. Recently I submitted my package > to CRAN (https://cran.r-project.org/web/packages/paropt/index.html). However, > there seems to be a problem with 'fopenmp' on Mac OS using clang++. I have > read many forums regarding the topic. Thus, I know that there is no support > for OpenMp on Mac OS (at least using the default clang compiler). > The error was: clang: error: unsupported option '-fopenmp' > Is it possible to detect the operating system and set according to this the > compile flags and use also a sequentiell version of the code? > Or is there a better way to cope with this problem? > Many thanks in advance for your help. > Regards, > Konrad > [[alternative HTML version deleted]] > > __ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
Re: [R-pkg-devel] OpenMP on MacOS
See https://cran.r-project.org/doc/manuals/r-release/R-exts.html#OpenMP-support for a way to enable OpenMP when it's available. If you need more detailed checks for the OpenMP support in the toolchain, you would need to use a configure script. For example, I'm using an autoconf configure script for the pense package ( https://github.com/dakep/pense-rpkg/blob/main/configure.ac) to detect if (and how) OpenMP is supported and whether the toolchain supports parts of more recent OpenMP versions. Best, David On Mon, Jun 7, 2021 at 7:52 AM Konrad Krämer via R-package-devel < r-package-devel@r-project.org> wrote: > Dear all, > I have a problem regarding OpenMP on Mac OS. Recently I submitted my > package to CRAN (https://cran.r-project.org/web/packages/paropt/index.html). > However, there seems to be a problem with 'fopenmp' on Mac OS using > clang++. I have read many forums regarding the topic. Thus, I know that > there is no support for OpenMp on Mac OS (at least using the default clang > compiler). > The error was: clang: error: unsupported option '-fopenmp' > Is it possible to detect the operating system and set according to this > the compile flags and use also a sequentiell version of the code? > Or is there a better way to cope with this problem? > Many thanks in advance for your help. > Regards, > Konrad > [[alternative HTML version deleted]] > > __ > R-package-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-package-devel > -- David Kepplinger, PhD https://www.dkepplinger.org [[alternative HTML version deleted]] __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
[R-pkg-devel] OpenMP on MacOS
Dear all, I have a problem regarding OpenMP on Mac OS. Recently I submitted my package to CRAN (https://cran.r-project.org/web/packages/paropt/index.html). However, there seems to be a problem with 'fopenmp' on Mac OS using clang++. I have read many forums regarding the topic. Thus, I know that there is no support for OpenMp on Mac OS (at least using the default clang compiler). The error was: clang: error: unsupported option '-fopenmp' Is it possible to detect the operating system and set according to this the compile flags and use also a sequentiell version of the code? Or is there a better way to cope with this problem? Many thanks in advance for your help. Regards, Konrad [[alternative HTML version deleted]] __ R-package-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-package-devel
